Art, there are many hitch companies that build 5th wheel hitches that bolt in under the box to the frame rails (similar to a large cross member), this then eliminates the two rails that are a pain every time you want a nice clean run on the bottom of your truck box for loading unloading applications. The installation of this hitches are not real simple as the box has to be unbolted and lifted a few inches for ease of installation.
Both of our B & W Companions have been mounted after the spray in liners and have caused no interference or problems. Ellis
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